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Journal of Aerospace Technology and Management

versão impressa ISSN 1984-9648versão On-line ISSN 2175-9146

J. Aerosp. Technol. Manag. vol.2 no.2 São José dos Campos mai./ago. 2010 


Evaluation of crystallization kinetics of poly (ether-ketone-ketone) and poly (ether-ether-ketone) by DSC

Gibran da Cunha Vasconcelos1 

Rogerio Lago Mazur2 

Edson Cocchieri Botelho3 

Mirabel Cerqueira Rezende4 

Michelle Leali Costa5  * 

1Univ. Estadual Paulista, Guaratinguetá - Brazil.

2Univ. Estadual Paulista, Guaratinguetá - Brazil.

3Univ. Estadual Paulista, Guaratinguetá - Brazil.

4Institute of Aeronautics and Space, São José dos Campos- Brazil.

5Univ. Estadual Paulista, Guaratinguetá - Brazil.


The poly (aryl ether ketones) are used as matrices in advanced composites with high performance due to its high thermal stability, excellent environmental performance and superior mechanical properties. Most of the physical, mechanical and thermodynamic properties of semi-crystalline polymers depend on the degree of crystallinity and morphology of the crystalline regions. Thus, a study on the crystallization process promotes a good prediction of how the manufacturing parameters affect the developed structure, and the properties of the final product. The objective of this work was to evaluate the thermoplastics polymers PEKK e PEEK by DSC, aiming to obtain the relationship between kinetics, content, nucleation and geometry of the crystalline phases, according to the parameters of the Avrami and Kissinger models. The analysis of the Avrami exponents obtained for the studied polymers indicates that both showed the formation of crystalline phases with heterogeneous nucleation and growth geometry of the type sticks or discs, depending on the cooling conditions. It was also found that the PEEK has a higher crystallinity than PEKK.

Keywords: Crystallinity; PEKK; PEEK; DSC

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Received: April 01, 2010; Accepted: April 20, 2010

* author for correspondence

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